Hi!
I was looking for my problem but I haven't found the solution.
So the problem is...I have the main menu of my game created and working with sfml 2.1. I have an OpenGL4.3 program working with GLFW3. Now, I want to write that program into my SFML project, but when I write the function LoadPlane(), that has the vertex_buffer and setup the VBO and VAO, and execute the project, the main menu disappears. I know the main menu is still working because I hear the music and the sounds and I can choose any option of the menu with de arrow keys, but I can't see anything, only a black screen.
Here is some code:
void LoadPlane() {
// make and bind the VAO
glGenVertexArrays(1, &gVAO);
glBindVertexArray(gVAO);
// Make a plane with triangles (two triangles per side)
GLfloat vertex_positions[] =
{
// (X, Y), (U, V)
-0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 1.0f, 1.0f
};
// make and bind the VBO
glGenBuffers(1, &gVBO);
glBindBuffer(GL_ARRAY_BUFFER, gVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_positions), vertex_positions, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), NULL);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_TRUE, 4 * sizeof(GLfloat), (const GLvoid*)(2 * sizeof(GLfloat)));
}
// init glew
glewExperimental = true;
if (glewInit() != GLEW_OK)
throw runtime_error("glewInit failed");
// GLEW throws some errors, so discard all the errors so far
while (glGetError() != GL_NO_ERROR) {}
// make sure OpenGL version 4.3 API is available
if (!GLEW_VERSION_4_3)
throw runtime_error("OpenGL 4.3 API is not available.");
// OpenGL settings
program = 0;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
// Create the program and attach all the shaders
LoadProgram();
// create buffer and fill it with the points of the triangle
LoadPlane();
// load texture
LoadTexture();
// setup tessellation
glPatchParameteri(GL_PATCH_VERTICES, 4);
// setup model-view-projection matrix
projectM = perspective((float)PI / 3, ((float) window.getSize().x / window.getSize().y), 0.1f, 100.0f);
viewM = lookAt(pos, target, vec3(0, 1, 0));
modelM = mat4();
window.pushGLStates();
// main loop with render and update
#pragma region OpenGL Render
win.popGLStates();
// use the progam
glUseProgram(program);
// calculate the mvp matrix and set the "mvp" uniform
glUniformMatrix4fv(glGetUniformLocation(program, "mvp"), 1, GL_FALSE, value_ptr(projectM * viewM * modelM));
// draw the VAO
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDrawArrays(GL_PATCHES, 0, 4);
win.pushGLStates();
// print GUI with sfml
If I comment LoadPlane(), I can see all the main menu.
Can someone help me?
